How do you make good thumbnails?

If you want to create thumbnails for videos, you can locate a website designated for creating those. I cannot give you specific websites since links that lead outside of are NOT allowed at all, and result in a warn or a ban from moderators.

Canva is one of the best graphic design tools online and good for thumbnails.

Explanation:

i need with the same thing

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.